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ABOUT THIS IMAGE:

This composite image is a view of the colorful Helix Nebula
taken with the Advanced Camera for Surveys aboard NASA's
Hubble Space Telescope and the Mosaic II Camera on the 4-meter
telescope at Cerro Tololo Inter-American Observatory in Chile.
The object is so large that both telescopes were needed to
capture a complete view. The Helix is a planetary nebula, the
glowing gaseous envelope expelled by a dying, sun-like star.
The Helix resembles a simple doughnut as seen from Earth. But
looks can be deceiving. New evidence suggests that the Helix
consists of two gaseous disks nearly perpendicular to each other.

One possible scenario for the Helix's complex structure is that
the dying star has a companion star. One disk may be perpendicular
to the dying star's spin axis, while the other may lie in the
orbital plane of the two stars. The Helix, located 690 light-years
away, is one of the closest planetary nebulas to Earth.

The Hubble images were taken on November 19, 2002; the Cerro
Tololo images on Sept. 17-18, 2003.